Furnace attachment



Nov.

H. F. EASTWOOD FURNACE ATTACHMENT Filed April 25, 1929 3 Sheets-Sheet l A TZORNE 1 Nov. 18, 1930. H. F. EASTWOOD 1,731,311

FURNACE ATTACHMENT Filed April 25, 1929 3 Sheets-Sheet 2 Fug-Z.

- VENT-0R MWL B Y 7 q Nov. 18, 1930. H. F. EASTWOOD FURNACE ATTACHMENT Filed Apliil 25, 1929 3'Sh eetsSheet 5 y P INVENTOR 4/7 AIZITORNEY Patented Nov. 18, 1930 l mmrr. EASTWOOD, or Ir shmanvonn jrunNAcE arracnianmf a s-cam mes April 2 5,

This invention relates to means for sup-" plying air" to a furnace so asto promote the combustion eificiency of the furnace by supplying airbelow. the, grate, supplying air ata pointdistant fromthe furnace outlet and regulating theamounts of air so supplied to-provide a constantly balanced relation between the amount suppliedabove and the amount of air supplied below the grate. In particular, the invention relates to a furnace attachment whereby the air supplied 7 above the grate may be delivered through the furnace door bymeans'of permanent connections, so thatthe door may be opened and the furnace fired without disconnecting One of the objects ofthe invention is to provide an attachment for furnaces in-which thetotal air supply is' 'delivered to a conduit leading: to the ash pit and; in which means are provided fordiverting a portion of the air from the 'conduitand delivering it above the grate, thelatter means includ ing permanent connections to thefire door so thatthe 'door maybe opened and the furnace. fired without disconnecting theattachment;- V 1 Another object of the invention is tofprovidesuch'an attachment with .means form regulating the amounts of airtdelivered, so

that a constantly balanced relation is. provided between the'amount of air delivered above thegrateand the amount of airdelivered below the grate of the furnace;

lAno ther objectof the invention isto pro-: vide means" for controlling the total air sup ply thus enabling the attachment'to be ap-. plied to furnaces: of various sizes. Another object of the invention is to provide a furnace-attachment whichmay be ap'-; plied to; the I furnace without alteration to the furnacewithwhich it is used. I

r l/Vith the above and-other objects "in View,

my invention consists in the parts, improvein nts and combinations more fully pointed out hereinafter. r

Turning now to the drawings:

' Figure 1, is'a front elevation of a furnace showing the attachment-applied.

furnace door.

: which distributes the air 1929." Serial no. 357,912.. p v e Figure 2 ,"is aside elevation, partly in sectlon, show ng the means, including the-permanentjconnectmns, for supplying. air to thecombustion chamber, through thedoor. 5 above the grateto the combustion chamber Figure 3,- is'a detail view of the permanent connections between the branch pipe andthe- Figure 4, isa detail view of theper-manent j connections showing the ball and socket joints and thetelescoping pipesbetween them.

Figure'5, is a detail view ofthe ball-and socketjoint connected to the firedoor, show- A in'g'the'openings for the passagefof air.

:Figure 6, is 'a' view of the difi'usingp'late passing throughthe door above thegrate v F Figure 7, is a top planview of the valveor.

damper, 'on l'ine'77- of Figure 1; this being the valve for regulating the. amounts 10f air delivered below and. above the grate;

I 111713116 drawings: which illustrate .onejem- I bodiment ofqthe invention, :theafurnace 1, shown, is: provided with; the usual. ash pit-12', V

ash pit door 3,:and grate 4. Above the grate 4, is fthecombustion chainb'erf5, and fire doo'r;

tachedto the usual furnace. 1, comprising housing 9, inwhich QnbracketlO, ismounted a. blower .11;v Motor '12,. alsoniounted on the 6,.pro vided at 7,-with an op.ening... The fur-'1 bracket, drives .the' blower. Mounted. on

housing. 9 in: frontof the bloweris anadjustable flap valve 13, which 'is adaptedto-be ad-E justed about-its pivots 14, sofas tocontrol the total amount of j-airj accessible to the blower, Housing 9, as .illustrated, into which; the air from the blower is delivered, terminates in an airdis'ichar'ge piped-5r -Means are'proviided for to the furnace'som e of the air being delivered below the grate, andsOmeQofQthe air being diverted and delivered aboveithegrate, the I J means for delivering the {airfabove the grate 1.1I1Gllldlllg permanent connections to the fur nace; door. :The connection. terminates; ad-i jacentvto the door and islpreferably attached to theoutside of the door. 1 g V I g f As shown, c'onnected to; air" discharge pipe air to be supplied to the furnace is discharged and socket to and formly over the fire bed.

1 so as to provide a constantly by pipe 15. Conduit 17 passes through the side of the furnace and communicates with the ash pit 2 of the furnace. Connected to and projecting from conduit 17, is branch pipe 18, for diverting a portion of the air passing through the conduit, Branch pipe 18, is provided. with an elbow portion 19, connected to it by means of the elbowjoint 20. In the form of the invention illustrated, the elbow portion 19 of the branch pipe is connected to a socket 21 by means of a hollow projection 22, of the socket into which the elbow portion fits. Bracket 23, securedto the front of the furnace by screws 24, provides a mounting for socket 21, which is secured to the bracket as by screws 25.

-Mounted in the socket 21 is a hollow ball 26 whichisprovided at 27, with openings permitting the passage of air. Secured to ball 26, is an outwardly projecting sleeve 28, into which is fitted a pipe 29, the opening in which registers with the upper air vopening of the ball 26. Pipe 29 is secured to the sleeve as by screw 30, passing through the sleeve and the pipe. v

Mounted on the fire door of the furnaceis another ball and socket joint. Socket 31 of the joint. is provided with an inwardly extending portion. 32,which terminates 'in a disc 33, the latter being secured by screws to the fire door 6. Socket 31, carries a hollow ball 34, provided at 35 with air openings; Ball 34, carries an outwardly projecting sleeve member 36, to which is secured a screw threaded collar 37 Socket 31, is also screw threaded to receive collar 37, thus connecting theballto the socket. Sleeve'member 36, surrounds a pipe 38,.the opening of which registers with one of the air openings of the .ball; Pipe 38 as shown, fits over pipe 29,

so as to form a telescoping connection.

As will be seen in the drawings the socket 31 is provided with a hollowchamber 39. 3A passage 40, provided inthe'in'wardly extend ing portion 32'of the socket registers'with the hollow chamber of the socket at one end and at its other end registers with the opening at 7 in the fire door. *Air may thus pass through the branch pipe, the lower ball and socket, the telescoping pipes, the upper ball through the opening in the firedoon' Secured to the backof the fire door, is a diffusing plate 41, which by means of'a p-lurality of orifices 42, distributesthe air which passes through the opening in thedoor, uni- Means are provided for-regulating the amount of air supplied above the grate and theamount of air supplied below; the grate balanced f relationbetween such-amounts As illustrated, the conduit 17 is provided,

below branch pipe 18, with an enlargedpor tion or collar 43, to which is secured a plate 44. A valve or damper slide 45, is provided which is adapted to slide across the opening in the conduit and allow more or less air to pass through the conduit and, consequently, less or more air to pass through the branch pipe. A set screw 46, is provided for securing the slide in its adjusted position.

It will be seen that the provision of an attachment having a conduit connected with the ash .pit 'throughtheside of the furnace and permanently connected with the combustion chamber through the furnace door, enables the attachment to be applied without alteration of the furnace with which it is'used.

Among the objects of the'invention the prov1sion of an attachment for supplying air above and below the grates offurnaces' of various sizes. This result is attained by so constructing the conduit, branch pipeand:

connections to the door that by properly adjusting the flap valve of the housingthe' amount of air access'ibleto the blower may.

be controlled so as to adapt'the attachment to furnaces of various sizes. v Consequently, 1t will only be necessary tomanufactureathe furnace attachment of my inventionin three ,or four sizes and these will be sufficient for.

the full range of furnace sizes from the largest to the smallestj In operation, after the fiapvalveha's been adjusted so as to supply: the proper" total quantity of air, the amount of air flow toithe ash'pit below the grate and theamount of air to be delivered .abovethe" grate' is esti mated. This estimation is basedron'the kind.

' be drawn into housing9 and deliveredby pipe 15 to conduit 16. Part'of the airpas'ses through conduit '16- and into the ash'pit of the furnace where it'passes upwardito the grate and promotes combustion. 1 The remaining portion of theair is diverted by branch pipe 18 and'passes through the ball and socket joints and telescopingzpipesto the opening in the furnace :door, whereaby means of the distributing plate, 'it'isdistributed uniformly over the fire bed and united withthe carbon monoxide gases-of the furnace. After :aperiod of observation of actual operating conditions the valve 45 may be readjusted so as to regulate the flow of air through the 'conduit and through the branch pipe, so'a'sto providetheedesired balanced relationbetween the. amount of air supplied above and .the i amountof air supplied-below the grate of the furnace. A After such final adjustment, the damper maybe secured in. position byimeans of the set screw 46. Thereafter, withthe-use ofthe-same kind of fuel, if anaveragefldepthoffirebed is changes may be made in carrying the invention into effect, withotit'departingfrom the principle thereof.

I claim:

1. An attachment for furnaces having an ash pit, a grate and a fire door with an opening above the grate, comprising a conduit connected to the ash pit, a motor driven blower for supplying air to the conduit, a branch pipe connected to said conduit for receiving a part of the air supplied to the conduit, permanent connections between the branch pipe and the fire door for supplying air through the opening in the door, a cliffusing plate for distributing the air above the grate, said permanent connections including a universal ball and socket joint mounted on the door of the furnace, the ball and the socket of said joint being provided with openings for the passage of air and a valve for regulating the amount of air supplied by the conduit and by the branch pipe so as to provide a constantly balanced relation between the amount of air delivered above the grate and the amount of air delivered below the grate of the furnace.

2. An attachment for furnaces hav ng a fire door with an opening above the'grate,

including a pipe, means for supplying air to said pipe and permanent connections be tween said pipe and the fire door for sup-i plying air through the openingin the fire door above the grate, said permanentconnections including a pair of universal ball and socket joints, the ball and the socket of each oint being provided with openings for. the

passage of air therethrough, one of said'joints being connected to the fire door and the other I to the air supply pipe and means for connecting said joints.

'3. An attachment for furnaces having a fire door with an opening above the grate, including a pipe, means for supplying air to said pipe and permanent connections be tween said pipe and the'fire door for supplying air through the opening in the door,

said permanent connections comprising a ball and socket oint mounted onvthe door pro- 1 vided with air openings, a ball and socket joint provided with'air openings, mounted on the furnace and connected to the air sup- The ply pipe and a pair of telescoping pipes connecting said joints.

4. An attachment for furnaces having an ash pit, a grate and a'fire door with an opening above the grate, comprising a conduit connected to the ash pit below the grate, a motor driven blower for supplying air to the conduit, a branch pipe connected to and projecting from the conduit for receiving a part of the air supplied by the conduit, permanent connections between the branch pipe and the fire door for supplying air through the opening in the door above the grate, said connections comprising a ball and socket oint provided with air openlngs mounted on the door, a ball and socket joint provided with air openings mounted on the furnace and cone nected to the branch pipe and a pair of telescoping pipes connecting said joints, and means for regulating the amount of air supplied by the conduit and by'the branch pipe so as to provide a constantly balancedrelation between" the amount of air delivered above the grate and the amount of air delivered below the grate of the furnace.

In testimony whereof, I have signed my name to this specification. HARRY F. EASTWOOD. 

